Answer:
Option A, Neither the researchers nor the study participants know who is receiving the drug and who is receiving the placebo.
Explanation:
In a double blind test, both the researcher and research participants are unaware of the exercise in a medical test . During the research active medication is given to some of the research participants making sure that researcher is unaware of that while observing all the participants. However, at the end of the experiment ,both the researcher and research participants get to know who has received the treatment.
Hence, option A is correct
Answer:
During exercise, your heart typically beats faster so that more blood gets out to your body. Your heart can also increase its stroke volume by pumping more forcefully or increasing the amount of blood that fills the left ventricle before it pumps.
Explanation:
Astronomy can best be described as a "<span>a. study of objects beyond earths atmosphere", although the subject of astronomy can be much more complicated. </span>
Answer:
Please find the difference between correlation and causation in the explanation section
Explanation:
Correlation and causation are two mistaken terms during data analysis and conclusion, however, these two terms mean different things.
Correlation shows that two variables relate to one another. In other words, two variables are said to CORRELATE if a relationship exists between them. For example, a correlation exists between sales of radios and sales of batteries because they are related.
On the other hand, causation describes how one variable's action causes an effect in the other variable. In other words, the one variable causes the other. For example, There is causation between sales of radios and sales of batteries if the sales of radio causes the sales of batteries.
The difference between these two is that the correlation of two things does not mean causation. That is, two things might be related but does not cause one another. Note that , sales of radio and batteries in the first example does not mean one causes the other.
Answer:
People with depression may have trouble maintaining a normal work schedule or fulfilling social obligations. This could be due to symptoms such as an inability to concentrate, memory problems, and difficulty making decisions.
Explanation:
